A method for preparing a film

Abstract

This invention discloses a method for preparing a film, relating to the technical field of battery string preparation, comprising the following steps: S1, pulling the film material from the roll, and cutting the film material into long strips of the required quantity and width during the pulling process, and adjusting the spacing between the long strips during the pulling process; S2, smoothly conveying the long strips with adjusted spacing and placing them on a strip carrying platform, cutting the long strips to form the required segmented strips for covering A welding strip and the segmented strips adapted to cover B welding strip; then, using a strip transport device, the cut segmented strips are transported away, and the spacing is completed during the transport process. By simultaneously completing the cutting and spacing adjustment during the film pulling process, and simultaneously completing the cutting and spacing during the transport process, the redundant steps of independent spacing adjustment and alignment in the traditional process are eliminated, significantly simplifying the preparation process, shortening the production time, and improving the production speed.

Description

Technical Field

[0001] This invention relates to the technical field of battery string fabrication, and more specifically to a method for preparing an adhesive film. Background Technology

[0002] In BC (back contact) cell stringing technology, the solder ribbons are divided into A solder ribbons and B solder ribbons. A solder ribbons and B solder ribbons are used to connect grid lines with different electrode properties on the cells. They are staggered in the arrangement direction of the cells in the cell string.

[0003] Common methods for connecting solder strips to solar cells include welding, adhesive bonding, and encapsulation film bonding. Because welding is costly and adhesive bonding suffers from poor conductivity, encapsulation film bonding is widely favored in the industry.

[0004] In adhesive film bonding technology, there are two bonding methods. One is to use an adhesive film covering the entire battery cell to coat the solder ribbon, thereby fixing the solder ribbon on the surface of the battery cell. The other is to use film strips to attach film strips to each solder ribbon separately, thereby fixing the solder ribbon.

[0005] like Figure 1 As shown, the preparation of existing membrane strips includes the following steps: D1 first, pull out the membrane material from the membrane roll; D2 use a pressure plate to press down the pulled membrane material and cut it into multiple membrane strips; D3 separate the multiple membrane strips; D4 cut the separated membrane strips into membrane segments of the required length; D5 finally transport the cut membrane segments in batches (transporting the membrane strips required for welding strip A, or transporting the membrane strips required for welding strip B).

[0006] The preparation steps of membrane segments in the existing technology are complicated, which requires a lot of preparation time and makes it difficult to achieve the required production speed. Therefore, there is an urgent need for a membrane strip preparation method with simple processing steps. Summary of the Invention

[0007] The purpose of this invention is to provide a method for preparing adhesive film, which slits and modulates the film strips during the film stretching process and splits the film strips during the transport process, thus simplifying the production steps and accelerating the production speed.

[0008] The objective of this invention is achieved through the following technical solution: A method for preparing an adhesive film, applicable to the bonding process of BC battery cells, includes the following steps: S1. Pull the film material out of the roll, and cut the film material into long strips of the required quantity and width during the pulling process, and change the distance between the long strips during the pulling process. S2. The long membrane strip with the adjusted pitch is smoothly conveyed and placed on the membrane strip carrying platform. The long membrane strip is cut into the required segmented membrane strips for covering the A welding strip and the segmented membrane strips adapted to cover the B welding strip. The cut segmented membrane strips are then moved away by the membrane strip transport device.

[0009] As a further improvement of the present invention, in step S1, the membrane material is pulled out by the membrane driving mechanism and continuously cut into equal parts by the annular blade of the membrane cutting mechanism to obtain a number of long membrane strips; then the membrane splitting mechanism gradually expands the long membrane strips to change the distance.

[0010] As a further improvement of the present invention, the film cutting mechanism is a rotating roller structure, with a plurality of annular blades uniformly assembled on its peripheral wall. The annular blades rotate synchronously with the roller body to achieve continuous cutting.

[0011] As a further improvement of the present invention, the membrane spacing mechanism includes a plurality of variable-pitch combs; the spacing between the comb teeth of the variable-pitch combs is progressively increasing along the membrane strip transport direction, which is used to progressively expand and change the pitch of the long membrane strip.

[0012] As a further improvement of the present invention, in step S2, a film pulling clamping mechanism is used to pull out the long film strip, the film pulling clamping mechanism including a pressing part and a clamping part; The pressing part includes a pressing frame, a support plate, a pressure plate, a pressure head, a lifting drive component, and a pressing drive assembly. The support plate is provided with a guide groove for placing a long film strip. One end of the pressure plate is hinged to the pressing frame, and one side of the pressure plate can abut against one side of the support plate. The other end of the pressure plate is provided with a snap-fit ​​connection to the support plate. The pressure head can extend into the guide groove to press the long film strip. The pressing drive assembly is disposed in the drive cavity of the pressure plate and can drive the pressure head to move closer to or away from the guide groove. The clamping part includes a clamping plate, a plurality of clamping jaws, a return spring, and a clamping drive component; a clamping shaft is provided on the clamping plate, the clamping jaws are rotatably connected to the clamping shaft, and the return spring and the clamping drive component act on the clamping jaws on both sides of the clamping shaft respectively; The pressure head is provided with a docking part, and the area of ​​the side of the docking part that holds the film strip is smaller than the area of ​​the film strip being held, forming an exposed part; The gripper is provided with a mating groove for mating with the docking part to clamp the film strip.

[0013] As a further improvement of the present invention, the pressing drive assembly includes a drive plate, a guide rod, and a pressing spring disposed in the drive cavity. The drive plate is slidably connected to the pressure plate, and the peripheral wall of the drive plate seals against the inner wall of the drive cavity. The guide rod connects the drive plate and the pressure plate, and the connection between the guide rod and the pressure plate is a slidable connection. The pressing spring is sleeved on the outer wall of the guide rod. The pressure plate has an air hole that communicates with the drive cavity. The end of the drive plate opposite to the drive cavity is connected to a pressure head.

[0014] As a further improvement of the present invention, one side of the guide film groove has a trumpet-shaped opening, and the opening is larger on the side near the docking part; an airbag is provided in the driving cavity above the driving plate, and the airbag is connected to the air hole on the pressure plate.

[0015] As a further improvement of the present invention, the membrane strip transport device described in step S2 includes several adsorption units, a mounting plate, a spacing component, an integral driving component, an adsorption mounting frame, and a first lifting driving mechanism. The adsorption mounting bracket is vertically moved by a first lifting drive mechanism and horizontally moved by an integral drive component; The adsorption mounting frame is provided with a slide rail that is opened along the membrane strip spacing direction. The adsorption unit is located below the mounting plate, and the upper part of the mounting plate is slidably connected to the slide rail. The spacing component includes a connecting plate and a spacing drive component. The connecting plate is used to connect adjacent mounting plates, and at least one side of the connecting plate and the mounting plate is a horizontally adjustable movable connection. The split drive acts on the adsorption units at both ends, and the extension and retraction directions are opposite, so as to drive all adsorption units to change pitch synchronously.

[0016] As a further improvement of the present invention, the adsorption unit includes an adsorption plate and a coated plate. The adsorption plate has adsorption holes, and the coated plate is disposed below the adsorption plate and has a clearance groove thereon. An elastic buffer structure is provided between the adsorption plate and the mounting plate.

[0017] As a further improvement of the present invention, a limiting pin is provided on the side of the adsorption plate facing the mounting plate, and a positioning hole and a photoelectric sensor corresponding to the limiting pin are provided on the side of the mounting plate facing the adsorption plate. This is used to monitor the compression range of the spring, preventing the battery cell from cracking and ensuring that insufficient pressure prevents the membrane strip from being adhered to the battery cell.

[0018] The above technical solution has the following beneficial effects: 1. By simultaneously completing slitting and spacing adjustment during the film stretching process and simultaneously completing cutting and spacing during the handling process, the redundant steps of independent spacing adjustment and alignment in the traditional process are eliminated, which significantly simplifies the preparation process, shortens the production time, and improves the production speed.

[0019] 2. The two stations of slitting and conveying and cutting and handling are carried out synchronously with variable distance operation to form a high-efficiency linkage. It can be directly used for string bonding of BC solar cells, avoiding intermediate stops and repeated positioning, and improving the overall cycle time.

[0020] 3. The variable-pitch comb is used to achieve progressively expanding and varying pitch. Combined with the elastic buffer structure, limit pin and positioning hole design in the film strip transport device, it ensures that the film strip does not shift, wrinkle or break during high-speed transport and handling, thus improving the adhesion accuracy and consistency.

[0021] 4. Through the coordinated design of the adsorption unit, connecting plate and spacing cylinder, the segmented film strips used to cover A welding strip and B welding strip can be transported at the same time, and precise spacing can be achieved during the transport process to meet the coating requirements of BC battery cells. Attached Figure Description

[0022] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0023] The structures, proportions, sizes, etc. shown in this specification are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0024] Figure 1 This is a schematic diagram of the existing membrane strip preparation method. Figure 2 This is a flowchart provided for the present invention; Figure 3 This is a schematic diagram of the film material separation mechanism provided by the present invention; Figure 4 This is a schematic diagram of the film-pulling clamping mechanism provided by the present invention; Figure 5 This is a three-dimensional schematic diagram of the clamping part provided by the present invention; Figure 6 This is a top view of the clamping part provided by the present invention; Figure 7 for Figure 6 A cross-sectional view along the AA direction; Figure 8 for Figure 6 A cross-sectional view along the BB direction; Figure 9 for Figure 6 Enlarged view of region A in the middle; Figure 10This is a three-dimensional schematic diagram of the combination of the clamping part and the moving mechanism provided by the present invention; Figure 11 for Figure 10 Enlarged view of region B in the middle; Figure 12 This is a schematic diagram of the membrane strip transport device provided by the present invention; Figure 13 for Figure 12 Enlarged view of region C in the middle; Figure 14 A schematic diagram of the membrane strip transport device provided by the present invention in the separation state (hidden adsorption mounting frame). Figure 15 for Figure 14 Enlarged schematic diagram of region D in the middle; In the picture: 11. Membrane feeding mechanism; 12. Membrane cutting mechanism; 13. Membrane driving mechanism; 14. Membrane separating mechanism; 15. Second frame; 2. Membrane clamping mechanism; 21. Pressing part; 211. Lifting drive component; 212. Pressing frame; 213. Support plate; 2131. Guide film groove; 214. Pressure plate; 215. Buckle; 216. Pressing head; 2161. Pressing part; 2162. Connecting part; 217. Pressing drive assembly; 2171. Pressing spring; 2172. Drive plate; 2173. Guide rod; 2174. Air connector; 22. Clamping part; 221. Clamping plate; 2211. Membrane guide groove; 222. Clamping shaft; 223. Gripper; 2231. Mating groove; 23. Moving mechanism; 3. Cutting mechanism; 4. Membrane strip transport device; 41. Adsorption unit; 411. Adsorption plate; 412. Glue-coated plate; 413. Limiting post; 414. Return spring; 415. Limiting pin; 42. Adsorption mounting bracket; 421. Slide rail; 43. Mounting plate; 431. Linkage protrusion; 44. First lifting drive mechanism; 45. Connecting plate; 451. Sliding hole; 461. First pitch cylinder; 462. Second pitch cylinder. Detailed Implementation

[0025] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0026] like Figure 2 As shown, a method for preparing an adhesive film, applicable to the bonding process of BC battery cells, specifically includes the following steps: S1. Pull the film material out of the roll and cut it into long film strips (referred to as film strips) of the required quantity and width during the pulling process. The distance between the long film strips is changed during the pulling process. S2. The long membrane strip with the adjusted pitch is smoothly conveyed and placed on the membrane strip carrying platform. The long membrane strip is cut into the required segmented membrane strips for covering the A welding strip and the segmented membrane strips adapted to cover the B welding strip. The cut segmented membrane strips are then moved away by the membrane strip transport device, and the pitch is completed during the transport process.

[0027] Of course, the segmented membrane strips mentioned above can also be split before being transported, and then transported by the membrane strip transport device, which can also achieve the purpose of changing the distance and transporting.

[0028] This method, through simultaneous variable-pitch operation at two workstations (slitting and conveying, cutting and handling), can be directly applied to the bonding of BC solar cells in strings, eliminating the redundant steps of independent pitch adjustment and alignment in traditional processes. This effectively simplifies the production process and significantly improves the preparation efficiency and processing accuracy of the bonding film for BC solar cell welding strips.

[0029] The membrane material separation mechanism used in step S1 is as follows: Figure 3 As shown, the entire assembly is mounted on the second frame 15, and mainly works in conjunction with the membrane feeding mechanism 11, membrane cutting mechanism 12, membrane driving mechanism 13, and membrane separating mechanism 14 to complete the membrane material cutting and spacing operations. During operation, under the traction drive of the membrane driving mechanism 13, the membrane material is smoothly pulled out by the membrane feeding mechanism 11 and continuously conveyed forward, passing through the membrane cutting mechanism 12 to complete the cutting process. The membrane cutting mechanism 12 has cutting blades arranged inside according to the required spacing and width specifications, which can cut the continuously conveyed whole-width membrane material into equal sections, cutting the membrane material into several long membrane strips of the required number and width. The long membrane strips after cutting are separated by the membrane separating mechanism 14 to achieve the separation of the long membrane strips.

[0030] In this embodiment, the above-mentioned film cutting mechanism 12 can adopt a rotating roller structure, with several annular blades evenly assembled on the circumferential wall of the rotating roller, which rotate synchronously with the roller body to achieve continuous cutting.

[0031] Furthermore, the aforementioned membrane separation mechanism 14 is mainly composed of several variable-pitch combs. Multiple sets of variable-pitch combs are fixed at intervals to the second frame 15, and the spacing between the comb teeth of the variable-pitch combs increases progressively along the membrane strip transport direction, which can gradually expand and change the pitch of the long membrane strip being bonded and transported.

[0032] In step S2, the film pulling clamping mechanism 2 pulls out the long film strip, the cutting mechanism 3 cuts the long film strip into segmented film strips of the required length to cover the A welding strip and the B welding strip, and then the film strip transporting device 4 transports out the segmented film strips used to cover the A welding strip and the B welding strip together.

[0033] like Figure 4 As shown, the membrane clamping mechanism 2 includes a pressing part 21 and a clamping part 22. Specifically: Combination Figures 5-9 As shown, the pressing part 21 includes a pressing frame 212, a support plate 213, a pressure plate 214, a pressing head 216, a lifting drive component 211, and a pressing drive assembly 217.

[0034] The lifting drive component 211 connects to the pressing frame 212 and drives the pressing frame 212 to move up and down. The support plate 213 is fixedly connected to the pressing frame 212. One end of the pressure plate 214 is hinged to the pressing frame 212 and one side of the pressure plate 214 can abut against one side of the support plate 213. The other end of the pressure plate 214 is provided with a buckle 215 to connect to the support plate 213. The support plate 213 has a guide groove 2131 on the side facing the pressure plate. The pressure head 216 is located on the side of the pressure plate 214 facing the support plate 213 and can enter the guide groove 2131. The pressing drive component 217 is located in the pressure plate 214 and can drive the pressure head 216 to move closer to or away from the guide groove 2131.

[0035] Furthermore, combining Figure 7 , Figure 8As shown, a driving cavity is formed within the pressure plate 214. The pressing drive assembly 217 includes a driving plate 2172, a guide rod 2173, and a pressing spring 2171 disposed within the driving cavity. The driving plate 2172 is slidably connected to the pressure plate 214, and the peripheral wall of the driving plate 2172 seals against the inner wall of the driving cavity. The guide rod 2173 connects the driving plate 2172 and the pressure plate 214, and the connection between the guide rod 2173 and the pressure plate 214 is a slidable connection. The pressing spring 2171 is sleeved on the outer wall of the guide rod 2173. The pressure plate 214 has an air hole communicating with the driving cavity. An air passage connector 2174 can also be provided at this air hole to facilitate air passage assembly. One end of the driving plate 2172 facing away from the driving cavity is connected to the pressure head 216 (one end of the pressing spring 2171 abuts against the driving plate 2172, and the other end abuts against the pressure head 216). During operation, gas is supplied to the drive chamber through the air holes on the pressure plate 214 to increase the pressure in the drive chamber, thereby pushing the drive plate 2172 to move and provide pressure to the pressure head 216, which in turn presses the diaphragm strip below the pressure head 216.

[0036] Of course, an airbag can also be installed in the drive cavity above the drive plate 2172. The two sides of the airbag abut against the pressure plate 214 and the drive plate 2172 respectively. Gas is delivered into the airbag through the air hole to control the volume of the airbag, thereby controlling the clamping force of the pressure head 216 connected to the drive plate.

[0037] Combination Figure 9 The pressure head 216 includes a pressing part 2161 and a docking part 2162. The docking part 2162 is fixedly connected to the side of the pressing part 2161 facing the clamping part 22. The pressing part 2161 can move into the guide film groove 2131 to press the film strip. The docking part 2162 extends out of the pressure plate 214. The area of ​​the side of the docking part 2162 that presses the film strip is smaller than the area of ​​the pressed film strip, that is, the film strip located below the docking part 2162 has an exposed part. At the same time, one side of the guide film groove 2131 has a funnel-shaped opening, and the opening near the docking part 2162 is larger, which facilitates the subsequent clamping part 22 to clamp the film strip.

[0038] Combination Figures 10-11 As shown, the clamping part 22 includes a clamping plate 221, a plurality of clamping claws 223, a return spring, and a clamping drive component.

[0039] A clamping shaft 222 is provided in the middle of the clamping plate 221. A gripper 223 is rotatably connected to the clamping shaft 222. One end of the gripper 223 is located on the side of the clamping shaft facing the pressing part 21, and the other end of the gripper 223 is located on the side of the clamping shaft away from the pressing part 21. A membrane guide groove 2211 is provided on the side of the clamping plate 221 facing the pressing part. The end of the gripper 223 facing the pressing part is located in the membrane guide groove. The gripper 223 located in the membrane guide groove has a mating groove 2231, which is mated with the mating part 2162 of the pressure head.

[0040] A clamping drive is provided on the side of the clamping plate 221 away from the pressing part, for driving the clamping plate 221 to flip. The clamping drive includes a clamping air chamber, and one end of the gripper 223 away from the pressing part is located in the clamping air chamber. A sealing gasket is provided below the gripper 223, and the clamping air chamber below the sealing gasket is connected to an air supply device. The air supply device can supply air into the clamping air chamber to increase the pressure in the clamping air chamber, so as to control the gripper 223.

[0041] In another embodiment, an airbag is provided inside the clamping air chamber, the airbag abuts against the bottom of the clamping air chamber and the gripper, and the airbag is connected to an air supply device.

[0042] A return spring is provided at one end of the gripper 223 facing the pressing part. One end of the return spring is connected to the gripper 223, and the other end is connected to the clamping plate 221. The return spring works in conjunction with the air supply device to realize the gripping and releasing action of the gripper 223.

[0043] like Figure 10 As shown, a moving mechanism 23 is fixedly connected to the side of the clamping plate 221. The moving mechanism 23 drives the clamping part 22 to move along the film conveying direction and along the perpendicular film conveying direction, adjusting the position of the clamping part 22. The driving of the moving mechanism 23 is not limited to using a lead screw module; it is only necessary to adjust the position of the clamping part 22 to ensure that it corresponds with the pressing part 21 and can clamp the film strip corresponding to the pressing part 21. During use, after the long film strip is placed on the film strip carrying platform, the pressing part 21 first clamps the film strip. When the clamping part 22 clamps the film strip, the pressing part 21 releases, and the moving mechanism 23 drives the clamping part 22 to move a predetermined length and then stops. The pressing part 21 then presses the film strip again. At this time, the cutting mechanism 3 moves over to cut the long film strip to the required length. The cutting mechanism 3 can use conventional cutting equipment in this industry to cut the long film strip as needed, so it will not be described in detail in this application.

[0044] Combination Figures 12-14 As shown, the membrane strip transport device 4, as the core transfer and spacing execution mechanism after the segmented membrane strip is cut, plays a key role in the stable adsorption, precise spacing and cross-station transport of the segmented membrane strip. Its structural design is adapted to the high precision and high efficiency requirements of BC battery cell welding strip attachment, including adsorption unit 41 (several units are provided), mounting plate 43, spacing component, overall drive component, adsorption mounting frame 42 and first lifting drive mechanism 44.

[0045] The adsorption unit 41 is the core component that directly contacts and grasps the segmented membrane strips. Its quantity is matched to the number of segmented membrane strips to be handled in a single batch, and can be adjusted to 2, 4, or more groups according to the specifications of the BC solar cells. Each group has a completely identical structure to ensure synchronous adsorption. The adsorption unit 41 includes an adsorption plate 411, a coating plate 412, and a reset component. The adsorption plate 411 has adsorption holes on the side facing the stringing platform. The adsorption holes are evenly arrayed, and the hole diameter is adapted to the membrane strip thickness and material to ensure a stable negative pressure during adsorption, preventing membrane strip deformation, wrinkling, or detachment. The coating plate 412 is located on the side of the adsorption plate 411 facing the stringing platform. The coating plate 412 has clearance grooves, the position of which corresponds to the position of the welding strip. That is, the width of the clearance groove is slightly larger than the width of the corresponding A and B welding strips, and the depth is adapted to the height of the welding strip, ensuring no interference when the membrane strip is attached to the welding strip and guaranteeing subsequent attachment accuracy.

[0046] like Figure 13 As shown, a limiting hole is formed on the adsorption plate 411, and a limiting post 413 is set in the limiting hole. The adsorption plate 411 is connected to the mounting plate 43 through the limiting post 413. A reset component, namely a reset spring 414, is sleeved on the limiting post 413. The two ends of the reset spring 414 abut against the adsorption plate 411 and the mounting plate 43, respectively. The limiting post 413 and the reset spring 414 cooperate to form an elastic buffer structure of the adsorption unit. In its natural state, the reset spring 414 keeps the adsorption plate 411 and the mounting plate 43 at a preset distance. When the first lifting drive mechanism 44 drives the adsorption unit to press down the adsorption membrane strip, the adhesive plate 412 is subjected to force after contacting the membrane strip, which drives the adsorption plate 411 to compress the reset spring 414 upward, achieving flexible contact and avoiding hard contact that could damage the membrane strip. When rising, the reset spring 414 rebounds, causing the adsorption plate 411 to return to its initial position.

[0047] like Figure 13 As shown, a limiting pin 415 is also provided on the side of the adsorption plate 411 facing the mounting plate 43. The mounting plate 43 is provided on the side facing the adsorption plate 411 with a positioning hole and a photoelectric sensor corresponding to the limiting pin 415. The limiting pin 415 and the positioning hole are the positioning structure of the adsorption unit. The limiting pin 415 is a cylindrical pin, fixed to the top of the adsorption plate 411, and has a clearance fit with the positioning hole on the mounting plate 43. It is used to monitor the compression range of the spring to prevent the battery cell from being cracked and to prevent insufficient pressure from failing to adhere the film strip to the battery cell.

[0048] The adsorption mounting frame 42 serves as the support base for the adsorption unit. A slide rail 421 is installed on it along the film strip spacing direction. The slide rail can be a linear slide rail or a dovetail groove structure, matching the slider on the mounting plate 43 to ensure smooth and uninterrupted sliding of the mounting plate 43. A first lifting drive mechanism 44 is connected to the adsorption mounting frame 42. Its stroke is set according to the film strip thickness, the height of the support platform, and the height of the stringing platform, enabling the adsorption unit to lift between the material handling station, the spacing station, and the unloading station. The overall drive mechanism can use a servo motor in conjunction with a lead screw module, a synchronous belt module, or a linear module to drive the adsorption mounting frame 42 and all adsorption units to move horizontally between the cutting station and the stringing station. The moving speed can be adjusted according to the production cycle, and the positioning accuracy meets the requirements for precise alignment of the film strip and the welding strip.

[0049] The spacing element is the core structure for realizing synchronous spacing changes of multiple adsorption units, including the connecting plate 45 and the spacing drive element.

[0050] Combination Figures 13-15 As shown, the side of the mounting plate 43 is provided with at least two linkage protrusions 431, and the connecting plate 45 connects the linkage protrusions 431 of adjacent mounting plates. Specifically, the connecting plate 45 is a long strip of metal plate with fixing holes and sliding holes 451 on both sides. The linkage protrusions 431 are protrusions integrally formed or bolted to the side of the mounting plate 43, and two adjacent mounting plates 43 are connected in series through the connecting plate 45. The sliding hole 451 is a long hole, the length of which is designed according to the maximum pitch stroke, so that there is no jamming and the gap is uniform during adjustment. In use, the linkage protrusion on one mounting plate is fixedly connected to the mounting plate through the fixing hole to achieve a fixed connection with one mounting plate, and the other mounting plate is slidably connected through the sliding hole 451 to achieve an adjustable position of the other mounting plate relative to the other mounting plate connected to the connecting plate.

[0051] The connecting plate 45 and the mounting plate 43 together form an adsorption mounting assembly for the adsorption unit 41 to be installed. The spacing between the mounting plates 43 within the adsorption mounting assembly is adjustable to meet the requirements for adjusting the spacing between the adsorption units 41.

[0052] The piecing drive includes a first piecing cylinder 461 and a second piecing cylinder 462, which are respectively disposed at both ends of the adsorption mounting assembly. The fixed end of the first piecing cylinder 461 is fixed to a mounting bracket on one side, and the telescopic end of the first piecing cylinder 461 is fixed to the adsorption unit located at the outermost end. The fixed end of the second piecing cylinder 462 is fixed to a mounting bracket on the other side, and the telescopic end of the second piecing cylinder 462 is fixed to the adsorption unit located at the other outermost end. The telescopic directions of the first piecing cylinder 461 and the second piecing cylinder 462 are opposite.

[0053] When the separation element is working, the action of the first separation cylinder 461 and the second separation cylinder 462 drives the outermost adsorption units to move closer or further apart from each other. At the same time, the action of the connecting plate between adjacent adsorption units causes all adsorption units to move closer or further apart from each other, thereby achieving the separation of the membrane strips adsorbed by the adsorption units.

[0054] The overall workflow of the film strip transport device 4 is as follows: After the cutting mechanism 3 completes the segmented film strip cutting, the overall drive unit moves the device above the cutting station. The first lifting drive mechanism 44 drives the adsorption unit to press down, and the adhesive plate 412 contacts the segmented film strip. The negative pressure system is activated, and the adsorption holes generate negative pressure to adsorb the film strip. Subsequently, the first lifting drive mechanism 44 drives the adsorption unit to rise, and the splitting drive unit is activated. Through cylinder linkage, all adsorption units complete the film strip splitting. Then, the overall drive unit moves the device above the stringing platform, and the first lifting drive mechanism 44 presses down again, the negative pressure system is turned off, and the segmented film strip is accurately placed at the corresponding welding strip position, completing one transport and splitting operation. This device has a simple structure and continuous operation. It can be synchronously linked with the previous cutting and slitting stations to realize the full automation of the BC battery cell welding strip bonding film preparation process, significantly improving production efficiency and processing consistency.

[0055] In summary, the embodiments of the present invention achieve the following technical effects: 1. By simultaneously completing slitting and spacing adjustment during the film stretching process and simultaneously completing cutting and spacing during the handling process, the redundant steps of independent spacing adjustment and alignment in the traditional process are eliminated, which significantly simplifies the preparation process, shortens the production time, and improves the production speed.

[0056] 2. The two stations of slitting and conveying and cutting and handling are carried out synchronously with variable distance operation to form a high-efficiency linkage. It can be directly used for string bonding of BC solar cells, avoiding intermediate stops and repeated positioning, and improving the overall cycle time.

[0057] 3. The variable-pitch comb is used to achieve progressively expanding and varying pitch. Combined with the elastic buffer structure, limit pin and positioning hole design in the film strip transport device, it ensures that the film strip does not shift, wrinkle or break during high-speed transport and handling, thus improving the adhesion accuracy and consistency.

[0058] 4. Through the coordinated design of the adsorption unit, connecting plate and spacing cylinder, the segmented film strips used to cover the A and B welding strips can be transported simultaneously, and precise spacing can be achieved during the transport process to meet the requirements of staggered arrangement of welding strips of B and C solar cells.

[0059] 5. After the film is drawn out from the film roll, it is cut into strips of the required number and width by the film cutting mechanism, and the film spacing mechanism is used to change the distance, which reduces the probability of mutual interference between the cut film strips. After passing through the film spacing mechanism, the film strips are pulled out by the film pulling clamping mechanism and cut into segmented film strips by the cutting mechanism. Finally, the segmented film strips are transported out by the film strip transport device. This is suitable for the production of multiple thin film strips and speeds up the production speed.

[0060] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0061] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0062] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for preparing an adhesive film, applicable to the bonding process of BC battery cell solder strips, characterized in that, Includes the following steps: S1. Pull the film material out of the roll, and cut the film material into long strips of the required quantity and width during the pulling process, and change the distance between the long strips during the pulling process. S2. The long membrane strip with the adjusted pitch is smoothly conveyed and placed on the membrane strip carrying platform. The long membrane strip is cut into the required segmented membrane strips for covering the A welding strip and the segmented membrane strips adapted to cover the B welding strip. The cut segmented membrane strips are then moved away by the membrane strip transport device.

2. The method for preparing the adhesive film according to claim 1, characterized in that, In step S1, the membrane material is pulled out by the membrane drive mechanism (13), and then cut into several long membrane strips by the ring blade of the membrane cutting mechanism (12); then the membrane splitting mechanism (14) gradually expands the long membrane strips to change the distance.

3. The method for preparing the adhesive film according to claim 2, characterized in that, The film cutting mechanism (12) is a rotating roller structure, with several annular blades evenly mounted on its circumferential wall. The annular blades rotate synchronously with the roller body to achieve continuous cutting.

4. The method for preparing the adhesive film according to claim 2, characterized in that, The membrane spacing mechanism (14) includes several variable-pitch combs; the spacing between the comb teeth of the variable-pitch combs increases progressively along the membrane strip transport direction, which is used to gradually expand and change the pitch of the long membrane strip.

5. The method for preparing the adhesive film according to claim 1, characterized in that, In step S2, a film pulling clamping mechanism (2) is used to pull out the long film strip. The film pulling clamping mechanism (2) includes a pressing part (21) and a clamping part (22). The pressing part (21) includes a pressing frame (212), a support plate (213), a pressure plate (214), a pressure head (216), a lifting drive (211), and a pressing drive assembly (217). The support plate (213) is provided with a guide groove (2131) for placing long film strips. One end of the pressure plate (214) is hinged to the pressing frame (212), and one side of the pressure plate (214) can abut against one side of the support plate (213). The other end of the pressure plate (214) is provided with a buckle (215) to connect to the support plate (213). The pressure head (216) can extend into the guide groove (2131) to press the long film strip. The pressing drive assembly (217) is provided in the drive cavity of the pressure plate (214) and can drive the pressure head (216) to approach or move away from the guide groove (2131). The clamping part (22) includes a clamping plate (221), a plurality of clamping claws (223), a return spring and a clamping drive; a clamping shaft (222) is provided on the clamping plate (221), the clamping claws (223) are rotatably connected to the clamping shaft (222), and the return spring and the clamping drive act on the clamping claws (223) on both sides of the clamping shaft respectively; The pressure head (216) is provided with a docking part (2162), and the area of ​​the side of the docking part (2162) that holds the film strip is smaller than the area of ​​the film strip being held, forming an exposed part; The gripper (223) is provided with a mating groove (2231) for mating with the docking part (2162) to clamp the film strip.

6. The method for preparing the adhesive film according to claim 5, characterized in that, The pressing drive assembly (217) includes a drive plate (2172), a guide rod (2173), and a pressing spring (2171) disposed in the drive cavity. The drive plate (2172) is slidably connected to the pressure plate (214). The peripheral wall of the drive plate (2172) seals against the inner wall of the drive cavity. The guide rod (2173) connects the drive plate (2172) and the pressure plate (214). The connection between the guide rod (2173) and the pressure plate (214) is a sliding connection. The pressing spring (2171) is sleeved on the outer wall of the guide rod (2173). The pressure plate (214) has an air hole that communicates with the drive cavity. The end of the drive plate (2172) facing away from the drive cavity is connected to the pressure head (216).

7. The method for preparing the adhesive film according to claim 6, characterized in that, The guide groove (2131) has a trumpet-shaped opening on one side, and the opening is larger on the side near the docking part (2162); an airbag is provided in the drive cavity above the drive plate (2172), and the airbag is connected to the air hole on the pressure plate (214).

8. The method for preparing the adhesive film according to claim 1, characterized in that, The membrane strip transport device (4) described in step S2 includes several adsorption units (41), mounting plate (43), spacing component, integral drive component, adsorption mounting frame (42) and first lifting drive mechanism (44). The adsorption mounting bracket (42) is vertically moved by the first lifting drive mechanism (44) and horizontally moved by the overall drive component; The adsorption mounting frame (42) is provided with a slide rail (421) opened along the membrane strip spacing direction. The adsorption unit (41) is located below the mounting plate (43). The upper part of the mounting plate (43) is slidably connected to the slide rail (421). The spacing component includes a connecting plate (45) and a spacing drive component. The connecting plate (45) is used to connect adjacent mounting plates (43), and at least one side of the connecting plate (45) and the mounting plate (43) is a horizontally adjustable movable connection. The split drive acts on the adsorption units at both ends, and the extension and retraction directions are opposite, so as to drive all adsorption units (41) to change pitch synchronously.

9. The method for preparing the adhesive film according to claim 8, characterized in that, The adsorption unit (41) includes an adsorption plate (411) and a coated plate (412). The adsorption plate (411) has adsorption holes, and the coated plate (412) is located below the adsorption plate (411) and has a clearance groove. An elastic buffer structure is provided between the adsorption plate (411) and the mounting plate (43).

10. The method for preparing the adhesive film according to claim 9, characterized in that, A limiting pin (415) is also provided on the side of the adsorption plate (411) facing the mounting plate (43), and a positioning hole and photoelectric sensor corresponding to the limiting pin (415) are provided on the side of the mounting plate (43) facing the adsorption plate.

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